单片机之矩阵键盘的驱动程序

#include

#define KEYPORT P1

#include "./delay/delay.h"

sbit seg_select = P2^0;      //段选

sbit bit_select = P2^1;      //位选

#define SEGPORT  P0

unsigned char segdata[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

unsigned char bitdata[8] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

unsigned char TempData[2];

void display(void)

{

  static unsigned char i = 0;

  SEGPORT = 0x0;              //消除重影

  seg_select = 1;

  seg_select = 0;

  SEGPORT = 0xff;

  bit_select = 1;

  bit_select = 0;

  SEGPORT = TempData[i];

  seg_select = 1;

  seg_select = 0;

  SEGPORT = bitdata[i];

  bit_select = 1;

  bit_select = 0;

    i++;

    if(2 == i)

    {

i = 0;

}

}

void timer0_init(void)                       //中断函数

{

EA = 1;                               //打开总中断

  TMOD |= 0x01;                        //设置定时器工作方式

  TH0 = (65536 - 2000) / 256;

  TL0 = (65536 - 2000) % 256;

  ET0 = 1;                           //打开定时器中断允许

  TR0 = 1;                           

}

void timer0_isr(void) interrupt 1    //中断服务程序

{

TH0 = (65536 - 2000) / 256;

  TL0 = (65536 - 2000) % 256;

  display();

}

unsigned char key_scan(void)

{

unsigned char keyvalue;

  KEYPORT = 0xf0;

  if(0xf0 != KEYPORT)                                // 有按键按下  

{

delay_ms(10);

  if(0xf0 != KEYPORT)                          //确实有按键按下

{

  //KEYPORT &= 0xfo;

KEYPORT = 0xfe;

  if(0xfe != KEYPORT)

{

keyvalue = KEYPORT;

  while(0xfe != KEYPORT);           //有按键抬起

delay_ms(10);

while(0xfe != KEYPORT);          //确实有按键抬起

return keyvalue;

}

KEYPORT = 0xfd;

if(0xfd != KEYPORT)

{

}

KEYPORT = 0xfb;

if(0xfb != KEYPORT)

{

}

KEYPORT = 0xf7;

if(0xf7 != KEYPORT)

{

}

}

}

return 0xff;

}

unsigned key_prc()

{

unsigned char keynum;

  keynum = key_scan();

  switch(keynum)

{

case 0x7e: return 0; break;

  case 0xbe: return 1; break;

  case 0xde: return 2; break;

  case 0xee: return 3; break;

  default: return 0xff; break;

}

}

void main()

{

unsigned char key;

timer0_init();

  while(1)

{

key = key_prc();

  if(0xff != key)

{

  TempData[0] = segdata[key / 16];

  TempData[1] = segdata[key % 16];

}

}

}

/*********delay.c*******/

void delay_us(unsigned char t)

{

while(--t);

}

void delay_ms(unsigned char t)

{

while(t--)

{

delay_us(245);

delay_us(245);

}

}

void delay_s(unsigned char t)

{

    while(t--)

{

        delay_ms(200);

delay_ms(200);

  delay_ms(200);

delay_ms(200);

  delay_ms(200);

}

}

/*******delay.h******/

#ifndef _DELAY_H_

#define _DELAY_H_

extern void delay_us(unsigned char t);

extern void delay_ms(unsigned char t);

extern void delay_s(unsigned char t);

#endif